from logging.config import fileConfig
import sys
import os

from sqlalchemy import engine_from_config
from sqlalchemy import pool

from alembic import context

# 添加项目根目录到 Python 路径
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))

from sqlmodel import SQLModel  # noqa: E402
from app.core.config import get_db_url  # noqa: E402

# 导入所有模型以确保它们被注册到SQLModel.metadata
from app.acme.models import *  # noqa: E402,F403,F401
from app.common.certificate_model import *  # noqa: E402,F403,F401

# this is the Alembic Config object, which provides
# access to the values within the .ini file in use.
config = context.config

# Interpret the config file for Python logging.
# This line sets up loggers basically.
if config.config_file_name is not None:
    fileConfig(config.config_file_name)

# 设置目标元数据为 SQLModel 的元数据
target_metadata = SQLModel.metadata

# other values from the config, defined by the needs of env.py,
# can be acquired:
# my_important_option = config.get_main_option("my_important_option")
# ... etc.


def _get_database_url() -> str:
    """从 Alembic 配置或应用设置中获取数据库 URL"""
    url = config.get_main_option("sqlalchemy.url") or ""
    url = url.strip()
    if not url:
        url = get_db_url()
    if not url:
        raise RuntimeError("Database URL is not configured for Alembic migrations.")
    return url


def run_migrations_offline() -> None:
    """Run migrations in 'offline' mode.

    This configures the context with just a URL
    and not an Engine, though an Engine is acceptable
    here as well.  By skipping the Engine creation
    we don't even need a DBAPI to be available.

    Calls to context.execute() here emit the given string to the
    script output.

    """
    url = _get_database_url()

    context.configure(
        url=url,
        target_metadata=target_metadata,
        literal_binds=True,
        dialect_opts={"paramstyle": "named"},
    )

    with context.begin_transaction():
        context.run_migrations()


def run_migrations_online() -> None:
    """Run migrations in 'online' mode.

    In this scenario we need to create an Engine
    and associate a connection with the context.

    """
    configuration = config.get_section(config.config_ini_section, {}).copy()
    configuration["sqlalchemy.url"] = _get_database_url()

    connectable = engine_from_config(
        configuration,
        prefix="sqlalchemy.",
        poolclass=pool.NullPool,
    )

    with connectable.connect() as connection:
        context.configure(connection=connection, target_metadata=target_metadata)

        with context.begin_transaction():
            context.run_migrations()


if context.is_offline_mode():
    run_migrations_offline()
else:
    run_migrations_online()
